Single flush receptacle



Nov. 26, 1929. H. J. MQRE'Y 1,736,831

S INGLE FLUSH kECEPTACLE Filed March 1925 'so' and Patented Nov. 26, 1929 UNITED STATES PATENT: oi-Flor.

i HARRY J'lMOREY, OI SYRACUSE, NEW YORK, ASSIGHO R '10 & SEYKOUB, INOOL POBATED, SYRACUSE, NEW YORK; A CORPORATION OF NEW YORK smem'; rnnsn nncnrracnn Application filed March 7, 1925. serial m. 13,835.

This invention relates to electric attachment receptacles and more particularly to single flush receptacles adapted to be mounted in a wall box and to receive an attachment plug therein.

It is a general ob] provide a novel and improved form of flush receptacle.

More particularly it is an object of this invention to provide in a flush receptacle a single unitary insulating structure adapted to receive therein the stationary contacts and having the binding posts or circuit terminals arranged one on either side of the block.

It is a further object of this invention to provide in a flush receptacle a single insulatmg member adapted to receive the stationary contacts or springs and the binding posts or circuit .terminals, a single screw serving to hold each contact and its binding post in position. J

A still further object of the invention consists in the provision of a flush receptacle in which the current carrying parts of opposite polarity are positioned at a maximum distance apart without the'interposition of any baflies, flanges or other projections and in which the recesses for retaining the two contacts are entirely isolated and open upon opposite faces of the porcelain.

In the accompanying drawings and following specification there is disclosed by way of example only, a single illustrative embodi ment of the present invention with the understanding however that various changes may be made therein by those skilled in the art, such asin the arrangement, proportion, form and size of the various parts Without departing from the spirit of the invention as v '40 set forth in the appended claims.

In the said drawings:

Fig. 1 is anelevation of the receptacle as ppsitioned in a wall and covered by a face p ate;

Fig. 2 is a side elevation thereof;

Fig. 3 is a vertical central section thereof;

Fig.1 4 is a section on line 44 of Figure 2 100 'ng in the direction of the arrows;

Fig. 5 is a section on line 5--5 of Figure 2 ect of this invention to i finish 'for the receptacle.

Fig. 6 is' a perspective view of one' of the Y contacts and its associated binding post.

The flush receptacle disclosed in this application is adapted to receive a single push plug but it is obvious that with. slight modications it could be adapted to recelve two or more. It comprises the porcelain or other insulating block 10 which is generally shaped as a parallelepiped having on one of its long v narrow faces the projectin circular boss 11. 00 This boss extends beyon the 'face which carries it and is adapted to project through the face plate 12 which serves to cover all of the rest of the porcelain block and the conduit box which receives. it and provides a A pair of metal straps 13 are set into the front face of the porcelain adjacent the boss 11 and extend beyond the ends thereof and are provided with holes 14 to receive screws to attach the porcelain block to a conduit or wall box, as is usual with this form of device. These straps. 13 are fastened to the insulating block by the screws 15 passing through the block from the back to the front and threaded into the straps. The-heads of the screws 15 are set down in the counterbores 16 in the block. Screws 17 serve to secure the face plate 12 to the straps 13, as best shown in Figure 3.

The circular boss 11is provided with the T-shaped' slots 18, as is common in receptacles, adapted to receive either parallel blade, tandem blade or polarized plugs and each of these slots enters intoa separate substantially rectangular recess 19 in the insulating block below the boss. These recesses open outwardly into opposite side faces of the block, as best shown in Figure 4, and have as their top walls the under side of the boss 11. They are separated from each other by a substantial transverse partition 20 almost as thick as the distancebetween the parallel blades of a plug. It will be seen that the recesses which are adapted to receive the stationary contacts, which are of opposite polarity, are entirely isolated from each other and have their openings. disposed on 0p 0- site side faces of the insulating block, t us affording a maximum of insulation and preventing any possibility of short circuiting. Into each of the recesses 19 is placed a universal spring contact member such as best shown in Fi ure 3, which is adapted to receive one of the blades of an attachment plug of any of the mentioned types.

Th1s articular form of stationary contact is well linown and need not be further described except to state that it is formed of a single piece of spring metal bent as shown, and has a base member 22 arranged in a plane at right angles to the direction of movement of the attachment plug upon being inserted, which base is integral with the single spring arm but separated from the two side arms 23 carried thereby so that the projecting tab 24 on the circuit terminal 25 may be placed above it and between it and the arms 23, as best shown in Figure 5. These two parts are assembled together and the arms 23 are long enough to exert a slight pressure on the surface of the tab 24 to hold the parts properly assembled while they are slipped into position in the recess 19 and the screw 26 passed throu h the opening in the base 22 and threa ed into the hole in the tab 24. The head of the screw 26 is set in a counter-bore in the back of the porcelain block and is preferably covered with a sealing wax while the shank of the screw passes throu h a suitable aperture in the porcelain bloc and enters the thread in the tab 24 and thus securely holds the binding post and the spring contact member in position.

The size and shape ofthe recesses in the porcelain block are such as to prevent any substantial twisting of the contacts about their retaining screws and in order to further prevent this the exposed parts 26' of the binding posts are arranged in a plane at right angles to the tabs 24 and offset from the plane of'the base-thereof, as best shown in Figure 6, and rest flat against the outer surfaces of the porcelain block, as shown in Figure 4. The wings 27 are provided onthe binding posts to assist in the wiring operation and to hold the loop of wire beneath the binding screws 28. Suitable channels 29 are provided in the walls of the recesses 19 to accommodate the ends of these binding screws 28. Since the binding posts have their portions 26' arranged flat against the outer-surfaces of the insulating block, rotation thereof and of the s ring contacts is prevented and a very rigi structure results which is quite simple to manufacture and to assemble, the whole contact assembly being held in position and together by the single screw 26.

The device as above described can be made very compact and the porcelain is of such a shape as to enable it to be readily molded. By the use of a single screw for fastening both the contact and its binding post in position,

cross strains are eliminated in the porcelain and the chances of its breaking are very rereadily wired since the binding screws are.

screws place it un-' on the sides, rather than on the back, as is common practice and hence a shallower box can beused as well as a narrower and shorter one.

is claimed as new and desired to be secured by Letters Patent .is:

1. In an attachment plug receptacle, a base 7 .member including a one piece insulating Having thus described the invention whatopening directly and in y only into a side I face of said block and said block being provided with restricted bbres'connecting said recesses with the face opposite said boss.

2. In an attachment plug receptacle in combination, a one piece insulating block having slots in the front face thereof communicating each with a recess in said'block, said recesses being completely se arated from each other and opening to their Full area only on alternate sides of said block, a contact member in each recess, a circuit terminal connected to each contact and extending outside of its recess through said opening and along the side face of sald block. V

3. In an attachment plug receptacle, in combination, a one piece insulating block having slots in one face thereof communicating each with a recess in said block, said recesses being completely separated from each other and opening fully on alternate sides of said block, a contact member in each recess,

cesses being completely separated from eachother and opening on alternate sides of said block, a contact member in each recess, a base on each contact member, a circuit terminal extending into each recess and overlying said base, a screw passing into said recess and securing said contact and terminal together and in said recess, said circ 7t terminals" extending in opposite directio s from said recesses,

binding screws in said terminals, said binding screws being substantially in axial alignment.

5. In an attachment plug receptacle, in combination, a one piece insulating block hav-, ing slots in one face thereof communicating each with a recess in said block, said bein completely separated from each other and aving their main openings on alternate sides of said block, a contact member in each recess, a base on each contact member, a circuit terminal extending into each recess and overlying said base, a screw passing into said recess and securing said contact and terminal together and in said recess, said circuit terminals extending in opposite directions from said recesses, binding screws in said terminals, one Wall of each recess being grooved to receive the ends of the binding screws.

6. In an attachment plug receptacle, in

' combination, a one piece insulatin block, a

boss projecting from the center 0 one face angled tab thereon, a perforated base on said contact member resting on the bottom wall of said recess, said tab overlying said base and engaging two of said arms, a screw passing through said block and base and into sai tab, and a binding screw passing through each terminal member and into a groove in the partition.

7. In an attachment plug receptacle, in combination, an'insulating block adapted to be received in a 'wall box, a projecting boss on the front thereof provided with a pair of plug prong receiving passages, said block having a separate recess below said boss for each passage and in communication therewith, each recess opening to substantially its full area only through a side face of said block and the two recesses having their openings oppositely directed, a prong receivmg contact 1n each recess and a clrcult terminal con-- nected to each contact and passin through its respective side opening and Iieing arranged outside of the block.

In testimony whereof I hereunto aflix my signature.

HARRY J. MOREY. 

